Always verify the pinout with a multimeter and a known ground. Never trust a forum photo. Automotive manufacturers changed pin functions mid-generation without updating connector faces.
If you are unsure about any step, consulting a professional wiring specialist is highly recommended, as a single wrong pin can cause significant, expensive damage to your ECU or engine. If you'd like, I can: ecu design pinout repack
Relying on online forums rather than an official manufacturer wiring diagram. Conclusion Always verify the pinout with a multimeter and
Use a silver permanent marker or label maker to tag every single connector plug (e.g., "Injector 1", "IAT", "ECU Plug A"). ecu design pinout repack
Create a spreadsheet that maps every single wire: [Function] -> [Original Pin] -> [New Pin] . 2. Required Tools